PROPAGATION AND ClIAP. 



I should observe here, that he was led to think of the 

 drilling of crops in the fields of England, from having, 

 when in France, observed the effects of inter- tillage on 

 the vines, in the vineyards. If he had visited America 

 instead of France, he would have seen the effects of that 

 tillage, in a still more striking light, on plants in the 

 Indian corn-fields ; for, he would have seen those plants 

 spindling, yellow, actually perishing, to-day, for want of 

 ploughing ; and, in four days after a good, deep, clean, 

 and careful ploughing, especially in hot weather, he 

 would have seen them wholly change theircolour, become 

 of a bright and beautiful green, bending their leaves 

 over the intervals, and growing at the rate of four inches 

 in the twenty-four hours. 



110. The passage, to which I have alluded, is of so 

 interesting a nature, and relates to a matter of so much 

 importance, that I shall insert it entire, and also the 

 plate made use of by Mr. Tull to illustrate his meaning. 

 I shall not, as so many others have, take the thoughts, 

 and send them forth as my own ; nor, like Mr. JOHN 

 CHRISTIAN CURWEN, a Member of Parliament, steal them 

 from TULL, and give them, with all the honour belonging 

 to them, to a Bishop. 



111. <e A Method how to find the distance to which roots 

 <e extended horizontally. A piece, or plot, dug and made 

 <f fine, in whole hard ground, as in Plate II. Fig. 1 . 



" The end A. 2 feet, the end B. 12 feet, the length of 

 " the piece 20 yards ; the figures in the middle of it are 

 f( 20 turnips, sown early, and well hoed. The manner of 



